The design uses 63-bit pn code as the code sequence of spread spectrum modulation. At the transmitting end, the information code is spread spectrum modulated; at the receiving end, the received spread spectrum modulated signal is despread, which enhances the anti-interference and reliability of the system. At the same time, the circuit design is implemented in Altera\'s Quartus II software using a combination of hardware description language VHDL and schematic diagram. The feasibility of the spread spectrum system is verified by downloading the circuit to Altera\'s CycloneIII EP3C10E144C8N chip for debugging.
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